Red Raspberry + Blackberry

Red raspberries and blackberries are poor companions and should not be planted near each other. The core problem is shared susceptibility to viral diseases, particularly raspberry mosaic virus complex, which spreads rapidly between the two crops via aphid vectors. Once established in a planting, mosaic viruses reduce yields significantly and have no cure. The standard recommendation from extension programs is a minimum 600-foot separation, a buffer that most home gardens and small orchards cannot realistically achieve.

Both crops share similar soil preferences (well-drained, slightly acidic, high organic matter) and cultural requirements, which can make it tempting to site them together. That compatibility does not outweigh the disease risk. Even if both plantings appear healthy at establishment, introducing one infected cane from either species can set off a spread that compromises the entire planting over two to three seasons. Growers with limited space should choose one or the other rather than risk cross-infection.